TRIODOPSIS. 313 



expanded, reflexed tooth ; the parietal wall bears a stout, elevated, arcuated, 

 oblique lamella, joined to the lower extremity of the peristome only ; on the 

 base of the shell is a transverse internal tubercle. Greater diameter 10, lesser 

 9 mill. ; height, 5| mill. 



Helix vultuosa, Gould, Pr. Bost. Soc. Nat. Hist, III. 39 (1848) ; in Terr. Moll., 

 II. 189, PI. XL. a, Fig. 4. — Reeve, Con. Icon., No. 711 (1852). — Pfeiffer, 

 Mon. Hel. Viv., III. 263 ; in Chemnitz, ed. 2, III. 305, PI. CXXVII. Figs. 

 10-12. — W. G. Binney, Terr. Moll, IV. 75; L. & Fr.-W. Sh., I. 133 

 (1869). —Bland, Ann. N. Y. Lye., VII. 439, PI. IV. Fig. 21. 



Triodopsis vultuosa,, Tkyon, Am. Journ. Conch., III. 53 (1867). 



Arkansas and Texas ; a species of the Texas Subregion. 



Jaw with 1 2 ribs. 



Lingual membrane as in the genus : 20 — 1 — 20 teeth, with 11 laterals. 



TliV form of this species described and figured by Bland (1. c.) has recently 

 been called Triodopsis Henriettas by Mazyck, Proc. Phila. Acad. Nat. Sci., 

 1877, 297. I hardly consider it distinct. 



Triodopsis loricata, Gould. 

 Vol. IE. PI. XXIX. a, Fig. 1. 

 Shell umbilicated, depressed, spire less convex than the base, thin, of a yel- 

 lowish-green color, having the surface everywhere ornamented with small, cres- 

 cent-formed scales of the epidermis, in relief, arranged along the lines of growth, 

 and in quincunx ; whorls 5^, slightly convex, separated by a deeply impressed 

 suture, and forming a low, conical spire; the periphery of the last whorl is 

 slightly angular near its posterior portion ; the base is rounded, tending rapidly 

 to a deep, umbilical depression, with a small perforation ; aperture small, very 

 oblique, crescentic, having a small, acute tooth on the right margin of the peris- 

 tome, a transversely oblong one at basal margin, and a prominent, compressed, 

 curved, nearly horizontal one on the parietal wall, thus giving a three-lobed 

 outline to the aperture ; peristome white, slightly reflected, having a very pro- 

 found constriction of the whorl directly behind it ; on the base of the shell is 

 an internal, transverse tubercle. Greater diameter, 6 mill. ; height, 3 £ mill. 



Helix loricata, Gould, Proc. Bost. Soc. Nat. Hist., II. 165 (1846) ; Moll. Expl. 



Exped., 68, Fig. 39, a, b, c. ; T. M. U. S., II. 145, PI. XXIX. a, Fig. 1. — 



Pfeiffer, Mon. Hel. Viv., I. 416. — W. G. Binney, Terr. Moll., IV. 11 ; L. 



& Fr.-W. Sh., I. 134 (1869). 

 Helix Lecontii, Lea, Trans. Am. Phil. Soc, X. 303, PI. XXX. Fig. 13 ; Obs., V. 



59 (1853). — Pfeiffer, formerly, Mon. Hel. Viv., III. 265. 

 Triodopsis loricata, Tryon, J .a. Journ. Conch., III. 54 (1867). 



California, near San Francisco and Eldorado County, to Klamath County. 

 A species of the California Region. 



Its general form and its aperture are very much like T. inflccta, Say, though 

 it is a much smaller shell, and the teeth of the aperture arc less developed. 



